INVESTIGATION OF THE ADSORPTION PERFORMANCE OF MnO₂  PREPARED BY THE CO-PRECIPITATION METHOD

Chu Thị Thúy Hằng; Nguyễn Thị Nguyệt

Chu Thị Thúy Hằng Khoa Công nghệ Hóa học và Môi trường, Trường Đại học Sư phạm Kỹ thuật Hưng Yên
Nguyễn Thị Nguyệt Khoa Công nghệ Hóa học và Môi trường, Trường Đại học Sư phạm Kỹ thuật Hưng Yên

Keywords: MnO2 , pHpzc, adsorbtion, Amido Black 10B

Abstract

Manganese dioxide (MnO₂) prepared via a co-precipitation route was explored as an adsorbent for the removal of Amido Black 10B from aqueous media. The adsorption performance of the material was assessed under different operating conditions, with emphasis on solution pH, initial dye concentration, and adsorbent reusability. Surface morphology and crystalline structure were examined using field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD), respectively. The point of zero charge (pHpzc) of MnO₂ was determined to be approximately 5.8, indicating that the surface charge characteristics of the material are strongly influenced by the surrounding pH. Under the investigated conditions, the highest dye removal efficiency approached 95% at pH 2, while the adsorption capacity reached approximately 370.63 mg.g⁻¹. In addition, the adsorbent retained a substantial fraction of its original performance after repeated use, maintaining a removal efficiency above 70% following three consecutive adsorption desorption cycles. These findings suggest that co-precipitated MnO₂ represents a promising candidate for the treatment of dye-contaminated wastewater, particularly streams containing anionic colorants.

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